.icon-32-youtube{
    background: url('youtube.png') no-repeat;
}
.icon-32-wikipedia{
    background: url('wikipedia.png') no-repeat;
}
.icon-14-youtube{
    background: url('youtube_14.png') no-repeat;
}
.icon-14-wikipedia{
    background: url('wikipedia_14.png') no-repeat;
}